Acquisitions, Dispositions, Ventures and Plant Closures (Ventures Narrative) (Details) (Mitsui & Co. Ltd. [Member], Acetyl Intermediates [Member])	3 Months Ended
Dec. 31, 2013 T
Mitsui & Co. Ltd. [Member] \| Acetyl Intermediates [Member]
Acquisitions, Dispositions, Ventures and Plant Closures [Line Items]
Expected production capacity per year	1,300,000.0

Expected production capacity per year, upon completion of Methanol facility.

No definition available.

Name:	ce_ExpectedProductionCapacityPerYear
Namespace Prefix:	ce_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration